Moon wrote: >>>What would be the largest flat worm in North America? Does anyone know?
...BTW I find terrestrial flat worms in my back yard that are several inches

long and up to 1/2" wide with the typical triangular shaped head and two
black eye spots.<<<

Jan writes:

I think the largest native aquatic flatworm is still D. dorotocephala...but
that some of the introduced terrestrial flatworms can be larger. There is a
population of an exotic in NE LA, but I have not yet seen any.

D. dorotocephala is > 25 mm (I have seen them approaching 40 mm) - hardly a
giant, but substantially larger than most of the other planarians which
usually range from 10-20 mm.
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